Weird soft brick situation - fastboot fine, recovery fine, OS stuck on boot animation

[NoSyt15]

Details first:
Oneplus One 64GB
Have never changed the kernel (so, stock? I think?)
TWRP 3.0.2.0
LineageOS 14.1 - "nightly" (weekly?) 2017-05-01
Phone is (was) encrypted


I'm not quite sure what to make of this:

Yesterday my phone wouldn't turn the screen on. I had received a notification, the notification light was flashing, and I had just used it, but double-tapping the screen or pressing the power button wouldn't turn the screen on. I wasn't overly worried, I've encountered bugs like this before, so I held the power button to restart the phone.

The OS wouldn't move past the boot animation.
The phone very happily booted into the recovery though.

Here's what I've attempted so far, in this order:

1. Wipe cache & dalvik cache.
2. Wipe cache, dalvik cache, and data.
3. Wipe cache, dalvik cache, data, and internal storage.
4. Restore nandroid backup
5. Fresh install of OS and Gapps
6. Fresh install of recovery in fastboot and then #5
7. Fresh install of a different OS (SlimRom 7.1.2 Beta 2017-04-21) and Gapps

Nothing is getting me back into Android, but as you can read, fastboot and recovery load up with no worries.

Does anyone have any idea as to what might be wrong? I'm about to load a new kernel on and see if that does anything, but I'm not holding my breath.

Any help would be greatly appreciated, thank you.

 

[Mr.Ak]

Details first:
Oneplus One 64GB
Have never changed the kernel (so, stock? I think?)
TWRP 3.0.2.0
LineageOS 14.1 - "nightly" (weekly?) 2017-05-01
Phone is (was) encrypted


I'm not quite sure what to make of this:

Yesterday my phone wouldn't turn the screen on. I had received a notification, the notification light was flashing, and I had just used it, but double-tapping the screen or pressing the power button wouldn't turn the screen on. I wasn't overly worried, I've encountered bugs like this before, so I held the power button to restart the phone.

The OS wouldn't move past the boot animation.
The phone very happily booted into the recovery though.

Here's what I've attempted so far, in this order:

1. Wipe cache & dalvik cache.
2. Wipe cache, dalvik cache, and data.
3. Wipe cache, dalvik cache, data, and internal storage.
4. Restore nandroid backup
5. Fresh install of OS and Gapps
6. Fresh install of recovery in fastboot and then #5
7. Fresh install of a different OS (SlimRom 7.1.2 Beta 2017-04-21) and Gapps

Nothing is getting me back into Android, but as you can read, fastboot and recovery load up with no worries.

Does anyone have any idea as to what might be wrong? I'm about to load a new kernel on and see if that does anything, but I'm not holding my breath.

Any help would be greatly appreciated, thank you.

Did you tried flashing stock Cyanogen Os through fastboot?

 

[NoSyt15]

Did you tried flashing stock Cyanogen Os through fastboot?

No, but I tried flashing a different OS, so I wouldn't think that would work? Especially considering Cyanogen is gone and not supporting anymore.

Either way, I worked it out in the end!

I thought I'd tried everything, but turns out I hadn't: I didn't try formatting the phone. Doing so "removed" the previous encryption, which meant that with a fresh flash I could boot again. After that I restored my backup, re-encrypted, and I'm good to go!

So it must've been something wrong with the decryption/boot process(?)

Anyway, thanks for your help!